how to insert new line in R shiny string

Question

In shiny, I have the following:

  output$sequenceText <- renderText({
    showSequence()
  })

showSequence <- reactive({
  selectedSeqs <- as.numer         


        

Answer 1

How about

  output$text2 <- renderUI({
    HTML('hello <br> world')
  })

Answer 2

To my knowledge, there are only two options to display multiple lines within shiny. One way with using verbatimTextOutput which will provide a gray box around you text (personal preference). The other is to use renderUI and htmlOutput to use raw html. Here is a basic working example to demonstrate the results.

require(shiny)
runApp(
  list(
    ui = pageWithSidebar(
      headerPanel("multi-line test"),
      sidebarPanel(
        p("Demo Page.")
      ),
      mainPanel(
        verbatimTextOutput("text"),
        htmlOutput("text2")
      )
    ),
    server = function(input, output){

      output$text <- renderText({
        paste("hello", "world", sep="\n")
      })

      output$text2 <- renderUI({
        HTML(paste("hello", "world", sep="<br/>"))
      })

    }
  )
)

This yields the following figure:

Answer 3

This is a different approach which is perhaps a bit simpler.

ui <- fluidPage(

  htmlOutput("text")
)

server <- function(input, output) {

  output$text <- renderText({

    paste0("<p>", letters[1:10], "</p>")
  })
}

# Run the application 
shinyApp(ui = ui, server = server)

Answer 4

There is also the write(x, file = "") trick:

renderPrint({
 write(showSequence(), file = "")
})

If the output is a verbatimTextOutput then this works.

Answer 5

for anyone reading this, you might also want to use tags$br(), which you simply have to insert as argument after a piece of text. For example,

tags$div(
    "a piece of text", tags$br(),
    "this will start from the new line now", tags$br(),
    "and this as well",
    "but not this" )